Merge branch 'dev' into f-jupyter

CHANGELOG.md

build.properties.d/00_default.properties

build.properties.files/footer_element_2.html

conf/core/json/ext_bottom_line.json

libs/plotly.js-1.52.2.zip

makefile

misc/ext_bottom_line_test_data.py

misc/revision_test_data.py

src/core/js/caosdb.js

src/core/js/edit_mode.js

src/core/js/ext_bottom_line.js

src/core/js/ext_revisions.js

src/core/js/preview.js

src/core/js/webcaosdb.js

src/core/xsl/entity.xsl

src/core/xsl/filesystem.xsl

src/core/xsl/main.xsl

test/core/index.html

test/core/js/modules/edit_mode.js.js

test/core/js/modules/entity.xsl.js